Dental handpiece.



A. CAMPBELL.

DENTAL HANDPIECE.

A'PPLIGATIUN FILED APRJ, 1914.

Patented 00h13, 1914.

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W/TNESSES A TTOHNEYS THE NORRIS PETERS C0.. PHOTO LITHO, wAsHlNGroN, D, CA

unirnn s'rATns P f TENT OFFICE. j

ALEXANDER CAMPBELL, or Los Ancienne, cnLrroRNrA.

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Specification of Letters Iatent.

` Patented Oct. 13, 1914.

`Application iiledvApril 7, 41914. Serial No. 830,166. v j

To all whom it may concern.' j

Be it known that l, ALEXANDER CAMPBELL, a citizen of the United States, anda resi dent of Los `Angeles, in the county of Los Angeles and State of California, have made an improvement in Dental Handpieces, of which the following is a specification.

My invention is embodied in a simpliiied and otherwise improved construction, arrangement, and combination of parts, as hereinafter described, and illustrated in the accompanying drawing, in which-- Figure 1 is a plan view of the hand-piece; Fig. 2 is a central longitudinal section of the same, on the line 2-2 of Fig. 1. i

The barrel or casing 2 of the hand-piece is tapered at its outer end 3 internally and externally. lllithin the casing is fitted loosely a sleeve 4 whose rear or inner portion is reduced in diameter, as indicated at 6. Around such reduced portion is fitted loosely a short outside sleeve 16, which `is constructed integrally with the skeleton frame 17 that constitutes an inner bearing of the spindle 9. The latter is `fitted' in the sleeve 4 and its forward end is threaded into the tool-holder 10, which is provided with a lengthwise slit. The tool holder 10 is secured on the threaded end of the spindle and a ring 27 is secured by a screw 26 on the rear or inner end of the sleeve 4 within the frame 17. This ring is knurled as shown in Fig. 1.

28 indicates a knurled nut which is ap` plied to the spindle andjams against the ring 27. rlhe casing 2 is fitted 'adjustably on the longer and shorter sleeve 4 and 16, and a screw 22 is applied to its inner end and abuts the forward shoulder of the frame 17. By this means the parts may be adjusted lengthwise relative to each other as may be required. The casing 2 1s locked to the outside sleeve 16 by means `of a screw 24 whose inner end enters an inclined groove 25, as shown.

15 ind Cates a set-screw which passes thro-ugh the sleeve 4 and entersy a longi` tudinal groove 11 formed in the inner portion of the tool-holder 10. By` this means the tubular part 10 is adapted to slide longitudinallyy and is locked rotativelyto the sleeve 4.

ln order to` assemble the parts of the `handpiece, the spindle 94 is inserted in the tool 2 and the sleevev 4 is then dropped into place, the screw 15 inl'such case entering the groove 11. The `outside sleeve 16 may then be fitted on the reduced portion 6 of the mainsleeve 4 and a ring 27 is secured on the reduced portionG by the screw 26, as shown.` j

It will be seen' that by holding the collar 27, and turning-the `nut 28, the spindle 9 may bemoved forward to `project the tool-y holder'10 out ofy the sleeve 4 sufficiently to permit insertion or withdrawal of the shank or bur or other .tool in the split end portion of the part 10. Then, by turning the nut 28 in the opposite direction. the `toolholder 10 will be drawn back intothe sleeve 4 so that the` beveled shouldersof the two parts will engage, as indicatedat 13, whereby the tool will be clamped in the part 10 between the two spring jaws of the same.

The tool is formed of comparatively few parts and may be quickly adjusted for gripping or releasing the other tools.`

Iclaimej 1. fIn, a dental hand piece, the combiantion with a'casing having" a `forward portion thereof formed tapering, a part adapted to Shanks"l of burs 'or j lit rotatively `against the interior wall at such' portion of the-casing, said part being constructed as a sleeve extending to the body of the implement, a spindle passing through the sleeve, and a tool holder held in the outer end of the sleeve, a lateral projection extending into a longitudinal channel in the tool holder, an adjustable sleeve fitted on the first named sleeve and extending into 2. A dental-handpiece comprising a casing, a4 spindle, a split tool holder whose outer end has a tapered shoulder, a sleeve receiving the tool holder and abutting the tapered shoulder on the outer end of the latter, an adjustable sleeve applied to the reduced rear portion ofthe first named the spindle an sleeve and constructed integrally with an described.

end bearing for the spindle a screw interf posed between the casing and the inner end ALEANDER CAMPBELL' d bearing upon said ring, as

5 of said bearing, a knurled ring applied to Vitnesses:

the inner end ofthe main sleeve, and a nut A. J. FLUREA, applied to the adj aeen-t threaded portion of ARTHUR G. BAKER.

Copies of this patent may be obtained for vfive cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

